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diff --git a/src/armadillo/include/armadillo_bits/access.hpp b/src/armadillo/include/armadillo_bits/access.hpp
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+// SPDX-License-Identifier: Apache-2.0
+// 
+// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
+// Copyright 2008-2016 National ICT Australia (NICTA)
+// 
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+// 
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// ------------------------------------------------------------------------
+
+
+//! \addtogroup access
+//! @{
+
+
+class access
+  {
+  public:
+  
+  //! internal function to allow modification of data declared as read-only (use with caution)
+  template<typename T1>   constexpr static T1&  rw (const T1& x)        { return const_cast<T1& >(x); }
+  template<typename T1>   constexpr static T1*& rwp(const T1* const& x) { return const_cast<T1*&>(x); }
+  
+  //! internal function to obtain the real part of either a plain number or a complex number
+  template<typename eT>   constexpr static const eT& tmp_real(const eT&              X) { return X;        }
+  template<typename  T>   constexpr static const   T tmp_real(const std::complex<T>& X) { return X.real(); }
+  
+  //! internal function to obtain the imag part of either a plain number or a complex number
+  template<typename eT>   constexpr static const eT tmp_imag(const eT                ) { return eT(0);    }
+  template<typename  T>   constexpr static const  T tmp_imag(const std::complex<T>& X) { return X.imag(); }
+  
+  //! internal function to work around braindead compilers
+  template<typename eT>   constexpr static const typename enable_if2<is_cx<eT>::no,  const eT&>::result alt_conj(const eT& X) { return X;            }
+  template<typename eT> arma_inline static const typename enable_if2<is_cx<eT>::yes, const eT >::result alt_conj(const eT& X) { return std::conj(X); }
+  };
+
+
+//! @}